Welcome to the Baby-Making Hot Spring Village

Kozukuri Onsenkyo" (Kozukuri Hot Spring Village). A scenic hot spring area known only to those in the know.
The protagonist, exhausted from work, falls asleep on the train and misses his stop.
The protagonist wakes up in a hot spring town called "Kozou," where he ends up staying at the hot spring inn "Shinonome."
We were greeted by the tenth-generation proprietress, Yoshino Shinonome, and her younger sister, Nonoka Shinonome.
That night, I learned that this place, "Kozo," was once a thriving red-light district, and that its traditions still continue to this day.​